Removing Duplicate Values from ArrayList

Question

I have one Arraylist of String and I have added Some Duplicate Value in that. and i just wanna remove that Duplicate value So how to remove it.

Here Example I got o

Answer 1

     public List removeDuplicates(List list) {
    // Set set1 = new LinkedHashSet(list);
    Set set = new TreeSet(new Comparator() {
        @Override
        public int compare(Object o1, Object o2) {
                 if(((Contact)o1).getId().equalsIgnoreCase(((Contact)2).getId()) ) {
                return 0;
            }
            return 1;
        }
    });
    set.addAll(list);
    final List newList = new ArrayList(set);
    return newList;
}